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Does estimate without samples size or percentage not just use 1024 as the
sample size?. If you look at dba_tab_columns the samples size will be in
there. If the table is not too big could you try it with compute statistics
or estimate statistics with 20 percent sample?
Iain Nicoll
-----Original Message-----
Sent: 13 September 2001 21:26
To: Multiple recipients of list ORACLE-L
!! Please do not post Off Topic to this List !!
I have analyzed them today via:
analyze table ... estimate statistics;
analyze table ... estimate statistics for all indexed
columns;
No data were added/modified agter that
--- "Nicoll, Iain (Calanais)"
<[EMAIL PROTECTED]> wrote:
> !! Please do not post Off Topic to this List !!
>
> Have they been analyzed recently? as if you were
> using histograms then if
> the last two months were added after your last
> analyze it would think they
> were fairly rare.
>
> Cheers
>
> Iain Nicoll
>
> -----Original Message-----
> Sent: 13 September 2001 19:11
> To: Multiple recipients of list ORACLE-L
>
>
> !! Please do not post Off Topic to this List !!
>
> Hi all:
>
>
> I have a query, which behaves differently depending
> on the input data (month/year). I have more than
> 15month worth of data in the database. The query
> is completed under 1 minute for the first 13 month,
> but for the last two months it just doesn't finish.
> I
> have cancelled it after 36 minutes. The explain
> plans
> are
> differ in that the "quick" query uses more hash
> jonts,
> while "slow" one utilizes more nested loops. All the
> tables are analyzed. This must have something to
> do with the data distribution, but what? Can anyone
> shed some light onto that?
>
> tia
>
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Author: Nicoll, Iain (Calanais)
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